package com.ibm.core.util;

import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.Date;
import java.util.HashSet;
import java.util.List;

public abstract class ObjectUtils {
	private static final int INITIAL_HASH = 7;
	private static final int MULTIPLIER = 31;
	private static final String EMPTY_STRING = "";
	private static final String NULL_STRING = "null";
	private static final String ARRAY_START = "{";
	private static final String ARRAY_END = "}";
	private static final String EMPTY_ARRAY = "{}";
	private static final String ARRAY_ELEMENT_SEPARATOR = ", ";

	public static boolean isCheckedException(Throwable ex) {
		return (!(ex instanceof RuntimeException)) && (!(ex instanceof Error));
	}

	public static boolean isCompatibleWithThrowsClause(Throwable ex, Class[] declaredExceptions) {
		if (!isCheckedException(ex))
			return true;
		if (declaredExceptions != null) {
			for (int i = 0; i < declaredExceptions.length; i++) {
				if (declaredExceptions[i].isAssignableFrom(ex.getClass()))
					return true;
			}
		}
		return false;
	}

	public static boolean isEmpty(Object[] array) {
		return (array == null) || (array.length == 0);
	}

	public static Object[] addObjectToArray(Object[] array, Object obj) {
		Class compType = Object.class;
		if (array != null)
			compType = array.getClass().getComponentType();
		else if (obj != null) {
			compType = obj.getClass();
		}
		int newArrLength = array != null ? array.length + 1 : 1;
		Object[] newArr = (Object[]) Array.newInstance(compType, newArrLength);
		if (array != null) {
			System.arraycopy(array, 0, newArr, 0, array.length);
		}
		newArr[(newArr.length - 1)] = obj;
		return newArr;
	}

	public static Object[] toObjectArray(Object primitiveArray) {
		if (primitiveArray == null)
			return new Object[0];
		Class clazz = primitiveArray.getClass();
		if ((!clazz.isArray()) || (!clazz.getComponentType().isPrimitive()))
			throw new IllegalArgumentException("The specified parameter is not a primitive array");
		int length = Array.getLength(primitiveArray);
		if (length == 0)
			return new Object[0];
		Class wrapperType = Array.get(primitiveArray, 0).getClass();
		Object[] newArray = (Object[]) Array.newInstance(wrapperType, length);
		for (int i = 0; i < length; i++) {
			newArray[i] = Array.get(primitiveArray, i);
		}
		return newArray;
	}

	public static boolean nullSafeEquals(Object o1, Object o2) {
		if (o1 == o2)
			return true;
		if ((o1 == null) || (o2 == null))
			return false;
		if (o1.equals(o2))
			return true;
		if (((o1 instanceof Object[])) && ((o2 instanceof Object[])))
			return Arrays.equals((Object[]) o1, (Object[]) o2);
		if (((o1 instanceof boolean[])) && ((o2 instanceof boolean[])))
			return Arrays.equals((boolean[]) o1, (boolean[]) o2);
		if (((o1 instanceof byte[])) && ((o2 instanceof byte[])))
			return Arrays.equals((byte[]) o1, (byte[]) o2);
		if (((o1 instanceof char[])) && ((o2 instanceof char[])))
			return Arrays.equals((char[]) o1, (char[]) o2);
		if (((o1 instanceof double[])) && ((o2 instanceof double[])))
			return Arrays.equals((double[]) o1, (double[]) o2);
		if (((o1 instanceof float[])) && ((o2 instanceof float[])))
			return Arrays.equals((float[]) o1, (float[]) o2);
		if (((o1 instanceof int[])) && ((o2 instanceof int[])))
			return Arrays.equals((int[]) o1, (int[]) o2);
		if (((o1 instanceof long[])) && ((o2 instanceof long[])))
			return Arrays.equals((long[]) o1, (long[]) o2);
		if (((o1 instanceof short[])) && ((o2 instanceof short[])))
			return Arrays.equals((short[]) o1, (short[]) o2);
		return false;
	}

	public static int nullSafeHashCode(Object obj) {
		if (obj == null)
			return 0;
		if ((obj instanceof Object[]))
			return nullSafeHashCode((Object[]) obj);
		if ((obj instanceof boolean[]))
			return nullSafeHashCode((boolean[]) obj);
		if ((obj instanceof byte[]))
			return nullSafeHashCode((byte[]) obj);
		if ((obj instanceof char[]))
			return nullSafeHashCode((char[]) obj);
		if ((obj instanceof double[]))
			return nullSafeHashCode((double[]) obj);
		if ((obj instanceof float[]))
			return nullSafeHashCode((float[]) obj);
		if ((obj instanceof int[]))
			return nullSafeHashCode((int[]) obj);
		if ((obj instanceof long[]))
			return nullSafeHashCode((long[]) obj);
		if ((obj instanceof short[]))
			return nullSafeHashCode((short[]) obj);
		return obj.hashCode();
	}

	public static int nullSafeHashCode(Object[] array) {
		if (array == null)
			return 0;
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = 31 * hash + nullSafeHashCode(array[i]);
		}
		return hash;
	}

	public static int nullSafeHashCode(boolean[] array) {
		if (array == null)
			return 0;
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = 31 * hash + hashCode(array[i]);
		}
		return hash;
	}

	public static int nullSafeHashCode(byte[] array) {
		if (array == null)
			return 0;
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = 31 * hash + array[i];
		}
		return hash;
	}

	public static int nullSafeHashCode(char[] array) {
		if (array == null)
			return 0;
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = 31 * hash + array[i];
		}
		return hash;
	}

	public static int nullSafeHashCode(double[] array) {
		if (array == null)
			return 0;
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = 31 * hash + hashCode(array[i]);
		}
		return hash;
	}

	public static int nullSafeHashCode(float[] array) {
		if (array == null)
			return 0;
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = 31 * hash + hashCode(array[i]);
		}
		return hash;
	}

	public static int nullSafeHashCode(int[] array) {
		if (array == null)
			return 0;
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = 31 * hash + array[i];
		}
		return hash;
	}

	public static int nullSafeHashCode(long[] array) {
		if (array == null)
			return 0;
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = 31 * hash + hashCode(array[i]);
		}
		return hash;
	}

	public static int nullSafeHashCode(short[] array) {
		if (array == null)
			return 0;
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = 31 * hash + array[i];
		}
		return hash;
	}

	public static int hashCode(boolean bool) {
		return bool ? 1231 : 1237;
	}

	public static int hashCode(double dbl) {
		long bits = Double.doubleToLongBits(dbl);
		return hashCode(bits);
	}

	public static int hashCode(float flt) {
		return Float.floatToIntBits(flt);
	}

	public static int hashCode(long lng) {
		return (int) (lng ^ lng >>> 32);
	}

	public static String nullSafeToString(Object obj) {
		if (obj == null)
			return "null";
		if ((obj instanceof String))
			return (String) obj;

		if ((obj instanceof Date))
			return DateTimeUtils.formatDate((Date) obj);

		if ((obj instanceof Object[]))
			return nullSafeToString((Object[]) obj);
		if ((obj instanceof boolean[]))
			return nullSafeToString((boolean[]) obj);
		if ((obj instanceof byte[]))
			return nullSafeToString((byte[]) obj);
		if ((obj instanceof char[]))
			return nullSafeToString((char[]) obj);
		if ((obj instanceof double[]))
			return nullSafeToString((double[]) obj);
		if ((obj instanceof float[]))
			return nullSafeToString((float[]) obj);
		if ((obj instanceof int[]))
			return nullSafeToString((int[]) obj);
		if ((obj instanceof long[]))
			return nullSafeToString((long[]) obj);
		if ((obj instanceof short[]))
			return nullSafeToString((short[]) obj);
		return obj.toString();
	}

	public static String nullSafeToString(Object[] array) {
		if (array == null)
			return "null";
		int length = array.length;
		if (length == 0)
			return "{}";
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0)
				buffer.append("{");
			else {
				buffer.append(", ");
			}
			buffer.append(String.valueOf(array[i]));
		}
		buffer.append("}");
		return buffer.toString();
	}

	public static String nullSafeToString(boolean[] array) {
		if (array == null)
			return "null";
		int length = array.length;
		if (length == 0)
			return "{}";
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0)
				buffer.append("{");
			else {
				buffer.append(", ");
			}

			buffer.append(array[i]);
		}
		buffer.append("}");
		return buffer.toString();
	}

	public static String nullSafeToString(byte[] array) {
		if (array == null)
			return "null";
		int length = array.length;
		if (length == 0)
			return "{}";
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0)
				buffer.append("{");
			else {
				buffer.append(", ");
			}
			buffer.append(array[i]);
		}
		buffer.append("}");
		return buffer.toString();
	}

	public static String nullSafeToString(char[] array) {
		if (array == null)
			return "null";
		int length = array.length;
		if (length == 0)
			return "{}";
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0)
				buffer.append("{");
			else {
				buffer.append(", ");
			}
			buffer.append("'").append(array[i]).append("'");
		}
		buffer.append("}");
		return buffer.toString();
	}

	public static String nullSafeToString(double[] array) {
		if (array == null)
			return "null";
		int length = array.length;
		if (length == 0)
			return "{}";
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0)
				buffer.append("{");
			else {
				buffer.append(", ");
			}

			buffer.append(array[i]);
		}
		buffer.append("}");
		return buffer.toString();
	}

	public static String nullSafeToString(float[] array) {
		if (array == null)
			return "null";
		int length = array.length;
		if (length == 0)
			return "{}";
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0)
				buffer.append("{");
			else {
				buffer.append(", ");
			}

			buffer.append(array[i]);
		}
		buffer.append("}");
		return buffer.toString();
	}

	public static String nullSafeToString(int[] array) {
		if (array == null)
			return "null";
		int length = array.length;
		if (length == 0)
			return "{}";
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0)
				buffer.append("{");
			else {
				buffer.append(", ");
			}
			buffer.append(array[i]);
		}
		buffer.append("}");
		return buffer.toString();
	}

	public static String nullSafeToString(long[] array) {
		if (array == null)
			return "null";
		int length = array.length;
		if (length == 0)
			return "{}";
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0)
				buffer.append("{");
			else {
				buffer.append(", ");
			}
			buffer.append(array[i]);
		}
		buffer.append("}");
		return buffer.toString();
	}

	public static String nullSafeToString(short[] array) {
		if (array == null)
			return "null";
		int length = array.length;
		if (length == 0)
			return "{}";
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0)
				buffer.append("{");
			else {
				buffer.append(", ");
			}
			buffer.append(array[i]);
		}
		buffer.append("}");
		return buffer.toString();
	}

	public static String identityToString(Object obj) {
		if (obj == null)
			return "";
		return obj.getClass().getName() + "@" + getIdentityHexString(obj);
	}

	public static String getIdentityHexString(Object obj) {
		return Integer.toHexString(System.identityHashCode(obj));
	}

	public static String toString(Object obj) {
		return toString(obj, "");
	}

	public static String toString(Object obj, String emptyString) {
		if (obj == null)
			return emptyString;
		String re = nullSafeToString(obj);
		if ((!StringUtils.hasLength(re)) && (StringUtils.hasLength(emptyString))) {
			re = emptyString;
		}
		return re;
	}
	
	public static void removeDuplicate(List arlList) {
		HashSet set = new HashSet(arlList);
		arlList.clear();
		arlList.addAll(set);
	}

}